Do you soak one or both sides of the stone?

I can't definitely say that soaking damages the 6000 side, but my 6000 side is starting to disintegrate after less than a dozen uses, and I've been soaking the whole stone (including the 6000) side.

What holds the stone to the base while sharpening so the stone doesnt move?

Basically the water creates suction with the water in the base and holds the stone. Along with the ridge on the base you wont be losing the stone any time soon. Even if you didn't have the base the friction from the stone on most surfaces will keep it stationary.

Is this also made to sharpen ceramic knives made from zirconium oxide?

Really, I would use diamond stones - they aren't that expensive and are much harder than zirconium oxide. A ceramic knife is a knife designed with a ceramic blade typically made from zirconium dioxide (ZrO2; also known as zirconia). These knife blades are usually produced through the dry-pressing and firing of powdered zirconia using solid-state sintering. It is 8.5 on the Mohs scale of mineral hardness, compared to 4.5 for normal steel and 7.5 to 8 for hardened steel and 10 for diamond. Aluminum oxide grit stones (like this) are 9 on the Mohs scale (not much harder). Silicon carbide stones are 9-10 and would hold up better. Diamond is best, but you need a quite fine grit to sharpen the edge to a cutting edge.

ASIN	B001DT1X9O
Auto Shutoff	No
Best Sellers Rank	#27,557 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #30 in Sharpening Stones
Brand	KING
Color	Brown
Customer Reviews	5.0 5.0 out of 5 stars (1)
Date First Available	7 August 2012
Item Weight	454 g
Material	Plastic
Model Number	3684
Product Dimensions	33.02 x 3.3 x 3.3 cm; 453.59 g

KING KW65 1000/6000 Grit Combination Whetstone with Plastic Base

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